设计模式之组合模式(Composite)

组合模式原理：组合模式的作用是讲继承同一父类的不同子类对象组合起来，形成一个树形的结构，例如公司的部门组织

代码如下

#include <iostream>

#include <string>

#include <list>

using namespace std;





/************************************************************************/

/* 组合模式的作用是讲继承同一父类的不同子类对象组合起来                 */

/************************************************************************/

class Company

{

public:

	Company(string name)

	{

		m_name = name;

	}

	virtual void  show(int depth)

	{



	}

	virtual void Add(Company *pComp)

	{



	}

protected:

	

	

	string m_name;

};



//组合类

class ConcreteCompany:public Company

{

public:

	ConcreteCompany(string name):Company(name)

	{



	}

	virtual void Add(Company *pCompany)

	{

		m_ListCompany.push_back(pCompany);

	}

	virtual void  show(int depth)

	{

		list<Company*>::iterator iter = m_ListCompany.begin();

		for (;iter != m_ListCompany.end();++iter)

		{

			(*iter)->show(depth + 1);

		}

	}

private:

	list<Company *> m_ListCompany ;

};



//具体类

class FinanceDepartment:public Company

{

public:

	FinanceDepartment(string name):Company(name){}

	virtual void  show(int depth)

	{

		for (int i = 0;i < depth;++i)

		{

			cout << "-";

		}

		cout << m_name << endl;

	}



};

class ITDepartment:public Company

{



public:

	ITDepartment(string name):Company(name){}

	virtual void  show(int depth)

	{

		for (int i = 0;i < depth;++i)

		{

			cout << "-" ;

		}

		cout << m_name << endl;

	}

};

int main()

{

	Company *root = new ConcreteCompany("总公司");

	Company *leaf1 = new FinanceDepartment("财务部");

	Company *leaf2 = new ITDepartment("信息部");

	root->Add(leaf1);

	root->Add(leaf2);



	Company *mid = new ConcreteCompany("分公司");

	Company *mleaf1 = new FinanceDepartment("财务部");

	Company *mleaf2 = new ITDepartment("信息部");

	mid->Add(mleaf1);

	mid->Add(mleaf2);

	root->Add(mid);

	root->show(1);

	

	return 0;

}